Silhouette Images Contributed by Martin Bulla

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5 silhouette images in all.

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Motacilla alba by Martin Bulla, based on Ren Hathway's illustration (CC BY 4.0)Phoenicurus ochruros by Martin Bulla, based on François Desbordes' illustration (CC BY 4.0)Sylvia borin by Martin Bulla, based on John Cox's illustration (CC BY 4.0)Picus viridis by Martin Bulla, based on John Cox's illustration (CC BY 4.0)Garrulus glandarius by Martin Bulla, based on Brian Small's illustration (CC BY 4.0)